Amazingly quickly. I'm so ok with it that when the "big girls" (the 2.5 months old) do it on me when I try to hold them, I just look at them and say, that's not enough to make me put you down, nice try though! and i let them all free range so the poo is in the shed by my motorcycle, on the deck...all over. i just wait for it to dry and sweep away. at this rate, I might be ready for my human babies' puke!